TopBunk: Thanks for correcting other information that I had received.
I am aware that the main carriers run overnight largely because of the Biz pax that are paying for the flight. Other carriers arrive overnight, turn and go or
vice versa.
The problem this gives BA + VS is that their machines are on the ground for 12 hours. SA have the same problem in London. Happily, they can pass on the cost of this lousy utilisation to us.
With CPT, VS consider it a tourist run only and arrive in the early morning and turn immediately. BA stays until the evening.